In November, the global population crossed 8bn. But experts say growth is not as rapid as it used to be and is now at its slowest rate since 1950.
Both India and China have seen declines in their fertility rates. In China, the population started declining last year, despite the country abandoning its one-child policy in 2016 and introducing incentives for couples to have two or more children.
In India too, fertility rates have fallen substantially in recent decades from 5.7 births per woman in 1950 to 2.2 births per woman today.